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Why is WSDOT improving safety and reliability on I-90?
Phase 4 is part of a 15-mile corridor improvement project to improve safety and reliability and reduce congestion along I-90 from Hyak to the Easton vicinity.
On an average day, 28,000 vehicles travel over Snoqualmie Pass and traffic numbers double on weekends and holidays. Traffic volumes are expected to increase 2.1 percent every year, reaching an average of over 41,000 vehicles per day by 2030.
This phase includes two miles of improvements between the Stampede Pass Interchange to the Cabin Creek Interchange.
The end result
WSDOT will continue to increase capacity and improve safety by:
Summer 2026 - construction begins
Fall 2029 - scheduled completion
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